Universal taper protractor



Apr. 24, 1923.

G. H. FELsKE UNIVERSAL TAPER PROTRACTOR Filed July 26 1922 2Sheets-Sheet l IApr. 24, 1923.

G. H. FELSKE UNIVERSAL TAPER PRomRAcToR Filed Jul 26 1922 2 Sheets-Sheet2 ,lwe/zfo?? Patented Apr. 24, 1923.

c UNITED STATES ATENTv orrice.

GUSTAVE H. FELSKE, 0F CLEVELAND, OHIO.`

'UNIVERSAL TAPER PROTRACTOR.

Application led July 26, 1922. Serial No. 577,520.

4and useful Improvement in Universal Taper' Protractors, of which thefollowing is a full, clear,l and exact description.

This invention relates to a universal taper 1)rotraotor adaptedparticularly for gauging tapered work such as may be machined in alathe, planer or shaper, and capable of use as a convenient tool formany other opera tions.

The principal object of the invention is to get a portable taperprotractor which is easily handled and adjusted, enabling the workman toreadily set the same for any taper and to machine a work piece withprecision on the desired taper.

.The above object is attained by the present invention which'may bebriefly summarized as consisting in certain novel details ofconstruction, and combinations and arrangements of parts which will bedescribed in the specification and set forth in the appended claims.

In the accompanying sheets of drawings, Fig. 1 is a top plan view of thedevice; Figs. 2, 3, 4 and 5 aresectional views substantially along thellines 22, 3-43, 4 4 and 5-5 of Fig. 1, looking in the directionsindicated by the arrows; Fig.r 6 is a side View of the same on aslightly reduced scale; and Figs. 7 and 8 are views similar to Fig. 1,showing how the protractor and the rotary blade may be shifted tovarious positions to permit vari ous measuring operations to beperformed.

The device formed in accordance with my invention includes a portableholder 1() which is preferably substantially U-shape as best shown inFig. 6. At one end of this holder there is a stationary head 11, with ajaw which receives a normally stationary scale or straight edge 12,which for convenience may be referred to as a blade. The word'ystationary is used as meaning-nonrotating, for the scale may be slidendwise in the jawof the head when conditions require, and to that end asuitable clamping and releasing device is provided. In this instancethis is in the form of a screw 13 having a flattened shank with anupturned lip engaging in a longitudinally extending groove 12 of theblade and having a threaded portion projecting through the rear of thehead and provided ywithv a tightening nut 14." With this device thescale'is always held back against the flat straight face of the jaw atright angles to the longitudinal axis ofthe device.

At the other end of the holder there is an This slide may be clamped tothe guideway by suitable clampi ing means here shown as a screw having aclamping head 17 seated in a slot 18 of the slide and provided with atightening and releasing nut 19 on the under side of the extension 15.

On the inner end of the slide 16 there is an annular protractor head 20the inner annular surface of which receives witha close fit a graduatedprotractor 21 normallyheld in any given positionor angular adjustmentbya clamping screw 22. When the screw 22 is loosened the protractor may beturned to any desired position which can be accurately determined by thegraduations on the pro'- tractor indicated at 21a, with the assistanceof a suitable zero point indicated at 21,b on the head.

The graduated portion of the protractor is flush with the surface of thehead 20, but a portion of the protractor stands up above the graduatedpart, and this portion is formed into a j aw 21d adapted to receive ascale7 straight edge or blade 23 which rotates with the protractor 21.The blade 23 is movable endwise in the jaw 21d precisely like thenormally stationary blade 12, and like the blade 12 it may be loosenedfor endwise movement and clamped in any desired position against thestraight back of the jaw by a nut 24 on the inner threaded part of aclamping screw 25, having a lip which engages a longitudinally extendingslot of the blade as in the first instance. The screw 25 extendsinwardly toward the center of the protractor, and the nut 24 is locatedin a central opening 21c thereof. The jaw 21d of the protractor is soformed that the lower side of the blade 23 is flush with and rides onthe surfacer of/thering or protractor head 20, and the blade 23 lies inthe same plane with the blade 12.

In the use of this device, and assuming that it is to be used by amachinist for gauging a tapered piece in a machine such as a lathe, theoperator will suitably position the slide 16 relative to the guideway soas to bring the blade 23 the desired distance from the blade 12. He willthen turn the protractor until the blade 23 is at the desired angle withrespect to the blade 12, this angle being designated A in Fig. 1. Ifnecessary, also, he will move the blades endwise through the jaws 11 and21d respectively. The parts are then in substantially the positionsindicated in Fig. 1. The operator will then gauge the work piece bygrasping the U-shape holder 10, and will apply the inner edges of theblades 12 and 23 to the work piece to test the taper formed thereon.

In the event the taper is to be formed on a small piece such as on thepoint of a tool, it may be desirable to rotate the protractor and itsblade 23 to the position shown in Fig. 8, wherein the angle A betweenthe end of the blade 23 and the edge of the blade 12 is the angle to begiven to the piece. To do this the blades will generally be movedendwise in their respective holdingl jaws from the positions that theywill usually occupy when the angle A between the longitudinal edges ofthe blades is the angle by which the measuringor gauging is done.

Additionally by shifting the blades endwise in their respective jaws androtating the protractor with its blade 23 to the proper position, theblades may be vutilized conveniently as a 30, or 600 angle, or any otherangle, or as a square indicated in Fig. 7.

Thus it will be seen that the universal taper protractor above describedcan be readily handled or manipulated, and easily and quickly adjustedto adapt it Afor gauging taper pieces which are to be machined on anydesired taper, or 'for the production ot any desired angle which may beadvantageously used by a machinist or mechanic for many specificallydifferent purposes.

It will be obvious therefore, that I have provided a very useful andconvenient tool in the hands of machinists or mechanics.

I do not desire tor be confined to the exact details shown, but aim inmy claims to cover adjusted position and said holder provided at theother end with a guideway, a slide in said guideway movable toward andfrom the first mentioned blade and provided with a rotary protractor anda second blade carried by said protractor and disposed opposite saidfirst mentioned blade.

3. A taper protractor comprising a portable holder having at one end ajaw, a blade adjustable endwise in `said jaw together with means forclamping the blade in adjusted position, a slide disposed opposite saidj aw and movable toward and Jfrom the-latter, a circular protractor headcarriedbysaid slide, a rotary protractor seated in said head andprovided with a jaw, and a blade in said second jaw adapted to be turnedwith the protractor and movable endwise in said jaw, there beingclamping means to secure it in adjusted position.

4. A taper protractor comprising a substantially U-shape holder providedwith two blades lying in the same plane and with two blade receivingparts in which the blades are movable in endwise direction andwith bladeclamping means, one of said blade receiving parts being iiXed, and aslide movable toward and from said fixed blade receiving part and havinga rotary protractor carrying the second blade receiving part.

5. In a taper protractor, a substantially U-shape holder having a bladereceiving jaw provided with a blade, a slide oppositely disposed withrespect to said blade and movable toward and from the same, means beingprovided for securing the slide in adjusted position, a circularprotractor head carried by the slide, a rotary protractor carried bysaid head and provided with a jaw having a. blade adapted to co-operatewith the first mentioned blade to form any desired' GUSTAVE H. FELSKE.

